LED Drive Circuit Merging Constant Current Sources
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Solution Overview
Problem
Existing display LED drive circuits face issues with increased temperature and reduced service life due to multiple constant current circuits, complex structure, and high current consumption, which also lead to increased manufacturing and running costs.
Innovation Solution
A display LED drive circuit design that reduces the number of constant current circuits by serially connecting switching elements with LEDs and resistors, allowing for opposite control of switching elements to manage voltage and current efficiently, and includes a cut-off switching element to minimize current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple constant current circuits are provided for each display LED, then the current control precision is improved, but the temperature increase and service life degradation occur
Solution Approach 1:
The patent merges multiple constant current circuits into a single shared constant current circuit that supplies current to multiple LED strings. This consolidation reduces the total number of constant current circuits, thereby decreasing heat generation and circuit temperature while maintaining precise current control through the shared circuit architecture.
Solution Approach 2:
The patent segments the LED display into multiple independent strings, where each string contains series-connected LEDs of different colors (R, G, B). This segmentation allows a single constant current circuit to control multiple strings independently through switching elements, achieving precise current control without requiring separate constant current circuits for each LED.
2Manufacturing precision
If multiple constant current circuits are provided for each display LED, then the current control precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple constant current circuits into one shared circuit, reducing the total component count and simplifying the circuit structure. The shared constant current circuit controls multiple LED strings through switching elements, eliminating the need for separate constant current circuits for each LED while maintaining control precision.
Solution Approach 2:
The shared constant current circuit serves multiple functions by controlling multiple LED strings simultaneously. This multi-functional design reduces device complexity by using a single circuit to perform what previously required multiple separate circuits, while the switching elements enable independent control of each string.
3Temperature
If switching means are added to reduce the number of constant current circuits, then the temperature is reduced, but the device complexity increases
Solution Approach 1:
The patent merges multiple constant current circuits into one shared circuit controlled by switching elements. This approach reduces temperature by consolidating heat-generating components while the switching elements provide the necessary control functionality, balancing temperature reduction with manageable control complexity.
Solution Approach 2:
The patent introduces switching elements that dynamically connect and disconnect LED strings from the shared constant current circuit. This dynamic control allows the system to reduce temperature by consolidating circuits while maintaining the ability to control individual LED strings as needed, managing complexity through selective activation rather than permanent complex wiring.
4Illumination intensity
If conventional drive circuits are used, then the LED brightness is maintained, but the power consumption is high
Solution Approach 1:
The patent employs periodic switching control where switching elements alternately connect different LED strings to the constant current circuit. This periodic action allows the system to maintain LED brightness by sequentially activating different strings while reducing overall power consumption compared to having all strings continuously powered by separate constant current circuits.
Solution Approach 2:
The patent merges multiple LED strings into a shared power delivery architecture where a single constant current circuit supplies current to multiple strings through switching elements. This consolidation reduces total power consumption by eliminating redundant constant current circuits while maintaining LED brightness through coordinated switching that ensures each string receives adequate current when activated.
Data Source
AI summary
A display LED drive circuit configured in such a manner that, for example, a constant current circuit, a green display LED circuit, and a red display LED circuit are connected in series and a resistor circuit having a resistor that generates a potential difference identical to the respective display LEDs is connected in parallel to the respective LED circuits. A corresponding switching element of the display LED circuit and a corresponding switching element of the resistor circuit connected in parallel are controlled to be opened and closed in opposite ways, another route connected to a source circuit in parallel is connected to the constant current circuit, a blue display LED circuit connected in parallel to the resistor circuit as described above, and a constant voltage diode in series, and a predetermined voltage is derived from an output terminal by the constant voltage diode and supplied to a control circuit.