LED Driver Voltage Control Without Processing Device
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Solution Overview
Problem
Conventional driving systems for light emitting devices require additional hardware components, such as processing devices, to adjust voltage levels, leading to increased costs and design complexity, especially when dealing with varying current magnitudes across LED drivers.
Innovation Solution
A driving system comprising a voltage converter circuit and a driver circuit that utilizes a matrix of scan lines and channel lines to control light emitting elements, where the driver circuit determines voltage levels based on channel line voltages and generates control signals to adjust output voltages, eliminating the need for a processing device and reducing hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a processing device is used to control the boost converter to adjust voltage magnitude, then voltage control accuracy is improved, but hardware cost and device complexity increase
Solution Approach 1:
The patent removes the processing device from the system architecture. Instead of using a separate processing device to control the boost converter, the voltage magnitude adjustment is achieved through the intrinsic relationship between LED driver output currents and the voltage divider network, eliminating unnecessary hardware components while maintaining control functionality.
Solution Approach 2:
The system uses the LED drivers themselves to generate the control signals for the boost converter. The voltage divider network automatically generates control signals based on the output currents from the LED drivers, creating a self-regulating system that does not require external processing intervention.
2Measurement precision
If a voltage divider is used with multiple LED drivers, then voltage distribution is improved, but design difficulty increases due to current magnitude variations
Solution Approach 1:
The patent applies different resistance values in the voltage divider network to match the specific current output characteristics of each LED driver. By customizing the resistance values locally rather than using uniform values, the system achieves accurate voltage distribution despite variations in driver output currents, simplifying the overall design process.
3Adaptability or versatility
If a processing device is required to coordinate multiple LED drivers and boost converter, then system control capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent combines the voltage control functionality into the existing LED driver circuitry and voltage divider network. The boost converter is controlled by signals naturally generated from the LED drivers through the voltage divider, merging multiple control functions into a unified system that maintains adaptability while simplifying manufacturing by reducing component count and interconnections.
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 allows for efficient control of light emitting elements without a processing device, reducing hardware costs and simplifying design, while ensuring accurate voltage magnitudes across the system.
Implementation Method 1
a voltage converter circuit (41), and a driver circuit (51). The voltage converter circuit (41) is to receive an input voltage and a control signal, and converts, based on the control signal, the input voltage into an output voltage
Data Source
AI summary
A driving system is operatively associated with a light emitting array that includes a plurality of scan lines, a plurality of channel lines and a plurality of light emitting elements. The driving system includes a voltage converter circuit and a driver circuit. The voltage converter circuit converts, based on a control signal, an input voltage into an output voltage that has a magnitude related to the control signal. The driver circuit drives the light emitting elements via the scan lines and the channel lines, is operable, based on voltages at the channel lines, to pull or not to pull a voltage at a common node to a logic level, and generates the control signal based on the voltage at the common node.