LED Filament With Bare-Die Control for Dynamic Light Functions
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Solution Overview
Problem
Conventional LED filaments lack the ability to independently input and transmit control signals, leading to limitations in achieving color change and dynamic display functions, and their large size hinders miniaturization and diverse shape design in lamps.
Innovation Solution
An LED filament design featuring a substrate with integrated bare-die control chip, multiple light-emitting chips, and electrical connection terminals, along with an independent signal control circuit, allowing for miniaturization and enabling functions like color change and dynamic display through a separate signal control circuit and reverse parallel light-emitting circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a packaged control chip is used in conventional LED filaments, then the control function is achieved, but the filament size increases and miniaturization becomes difficult
Solution Approach 1:
The patent extracts the control chip from its traditional packaged form and integrates it directly onto the substrate without a separate package. This removes the packaging layer and reduces the overall filament size while maintaining the control functionality through direct mounting of the control chip on the substrate.
Solution Approach 2:
The control chip is merged with the substrate structure, eliminating the need for separate packaging. The control chip, light-emitting chips, and substrate form an integrated assembly where the control chip is directly mounted on the substrate, reducing overall volume while preserving control functions.
2Device complexity
If conventional LED filaments use only two electrical connection terminals, then the structure is simple, but independent input and transmission of control signals cannot be achieved
Solution Approach 1:
The electrical connection terminals are segmented into multiple groups: power input terminals (positive and negative) and separate control signal terminals (IN and OUT). This segmentation allows independent transmission of power and control signals while maintaining a relatively simple overall structure.
Solution Approach 2:
The electrical connection terminals serve multiple functions: some terminals handle power input while others handle control signal input and output. This multi-functionality enables both power supply and control signal transmission through the same terminal structure without requiring completely separate connection systems.
3Reliability
If the package thickness of the filament is increased to accommodate a packaged control chip, then the control function is achieved, but the filament size increases and lamp miniaturization becomes more difficult
Solution Approach 1:
The control chip is extracted from its packaged form and mounted directly on the substrate, eliminating the need to increase package thickness. This direct mounting approach maintains the filament's thin profile while preserving control functionality.
Solution Approach 2:
Instead of increasing the thickness dimension to accommodate a packaged control chip, the control chip is integrated in the planar dimension of the substrate. This dimensional reorganization allows control functionality without increasing filament thickness, enabling miniaturization.
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 multiple light colors, phantom display, and flashing functions while reducing the size and cost of the filament, facilitating automated production and miniaturization of lamps with diverse forms.
Implementation Method 1
The light-emitting chips includes first light-emitting chips
Implementation Method 2
light-emitting chips each have one end electrically connected to a corresponding one of the LED control output ports
Data Source
AI summary
An LED filament and a lamp are disclosed. The LED filament includes a substrate, a conductive circuit, a control chip, light-emitting chips, and electrical connection terminals. The conductive circuit includes an independent signal control circuit. The control chip is a bare-die chip, and has a VDD interface, a GND interface, an IN interface, an OUT interface, and LED control output ports. Two ends of the substrate have four electrical connection terminals electrically connected to the VDD interface, the GND interface, the IN interface and the OUT interface, respectively. Both ends of the first light-emitting chips are electrically connected to the LED control output ports and the VDD interface to form a light-emitting circuit. All components are integrated and packaged, small in size and easy to shape, so as to reduce production costs and diversify the shapes of lamps.