LED Current Regulator Circuit Using Periodic Switching for Wiring Reduction
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Solution Overview
Problem
Conventional light emitting device current regulator circuits require complex wiring and suffer from high power loss due to the need for multiple wires and high operation voltages, which increases manufacturing costs and safety concerns, especially in larger displays where the number of light emitting device strings and devices connected in series is high.
Innovation Solution
A light emitting device current regulator circuit that generates an internal voltage using a charge storage device from the second end voltage, allowing for reduced wiring by intermittently adjusting current to zero or low levels, thereby raising the second end voltage and eliminating the need for external power supply, thus reducing power consumption and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting device strings are connected in series with high operation voltage, then the brightness and coverage of the display is improved, but the wiring complexity and power loss increase significantly
Solution Approach 1:
The patent divides the light emitting device system into multiple independent control units, where each unit can be controlled separately. This segmentation allows the system to achieve high illumination intensity through multiple strings while reducing wiring complexity by managing each segment independently with simplified control circuits.
Solution Approach 2:
The patent employs periodic switching control where the current to light emitting devices is adjusted in periodic cycles rather than continuously. By intermittently reducing current to zero or low levels, the system raises the second end voltage periodically, enabling simplified wiring architecture while maintaining adequate average brightness through duty cycle control.
2Illumination intensity
If high operation voltage is used to power multiple light emitting devices in series, then the illumination intensity is improved, but the power loss and safety concerns increase
Solution Approach 1:
The patent uses periodic current reduction to raise voltage levels. By intermittently reducing current to zero or low levels, the second end voltage rises, allowing the system to operate with lower average power consumption while maintaining adequate illumination through periodic high-voltage states.
Solution Approach 2:
The patent dynamically changes operating parameters including current level and voltage level based on operational needs. By adjusting these parameters periodically rather than maintaining constant high values, the system achieves required illumination intensity while significantly reducing average power loss and improving safety.
3Area of stationary object
If the number of light emitting device strings is increased to cover larger display areas, then the display coverage is improved, but the number of wires and space requirements increase
Solution Approach 1:
The patent segments the control function across multiple independent units, allowing display coverage to be expanded by adding more segments without proportionally increasing wiring complexity. Each segment uses simplified control architecture that can be replicated and added in parallel.
Solution Approach 2:
The patent designs a universal control unit that can serve multiple light emitting device strings. This multi-functional unit reduces the overall number of wires needed by allowing one control unit to manage multiple strings through shared control signals and periodic switching schemes.
4Manufacturing precision
If conventional power management circuits are used to control multiple light emitting device strings, then the current regulation is improved, but the manufacturing cost and wiring complexity increase
Solution Approach 1:
The patent divides the current regulation function into segmented, modular control units that can be manufactured independently and assembled. This segmentation maintains precise current regulation for each segment while reducing overall manufacturing cost through standardized modular design and simplified wiring requirements.
Solution Approach 2:
The patent uses dynamic parameter changes including intermittent current reduction to achieve precise current regulation with simpler, lower-cost circuitry. By changing operating parameters periodically rather than using complex continuous regulation circuits, the system maintains manufacturing precision while reducing manufacturing cost.
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
This solution simplifies wiring, reduces power loss, and decreases manufacturing costs by eliminating the need for high-voltage connections, while maintaining sufficient internal voltage for circuit operation, thus enhancing the safety and efficiency of light emitting device control circuits.
Implementation Method 1
an internal voltage generation circuit coupled to the second end, which generates an internal voltage according to a voltage at the second end (second end voltage) to supply electrical power to the light emitting device current regulator, wherein the internal voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the internal voltage
Data Source
AI summary
A light emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.