LED Control Circuit Automatic Latch Signal Generation
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Solution Overview
Problem
Existing LED control systems face inefficiencies in signal transmission and precision control due to the need for multiple electronic lines and the limitations of Pulse Width Modulation (PWM) technology, which can result in excessive waiting times or erroneous enabling of LED devices.
Innovation Solution
A control circuit comprising a shift register unit, latch register unit, LED driving circuit, and latch signal generator that automatically generates a latch signal using an input data signal and clock signal, allowing for precise control of LED devices with reduced electronic lines and adaptable timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a clock loss detection circuit with a fixed detection period is used to generate the latch signal automatically, then the system can reduce the number of electronic lines, but the system wastes a lot of time for waiting if the detection period is too long, or the minimum input frequency of the clock signal will be limited if the detection period is too short
Solution Approach 1:
The patent applies the dynamics principle by making the detection period adjustable rather than fixed. The control circuit allows the detection period to be dynamically configured based on system requirements, enabling optimization between waiting time and clock signal frequency constraints. This resolves the contradiction by allowing the system to adapt the detection period to specific application needs rather than being constrained by a predetermined fixed value.
2Loss of time
If the detection period is set too short, then the waiting time is reduced, but the minimum input frequency of the clock signal will be limited and the latch signal will be generated easily by unexpected events
Solution Approach 1:
The adjustable detection period allows the system to dynamically select an optimal value that balances waiting time and reliability requirements. By configuring the detection period appropriately, the system can avoid generating latch signals from unexpected events while still maintaining acceptable waiting times.
3Reliability
If the detection period is set too long, then the reliability of latch signal generation is improved, but the system wastes a lot of time for waiting
Solution Approach 1:
The configurable detection period enables the system to find the optimal balance between reliability and waiting time. Different applications can configure different detection period values based on their specific requirements for both reliability and response time.
4Adaptability or versatility
If six electronic lines are used for control in the series control scheme, then lamp apparatuses can be controlled with the same system, but it requires extra buffer amplifiers to prevent signals from degrading
Solution Approach 1:
The patent extracts and eliminates the need for separate latch signal and enable signal lines by generating the latch signal automatically within each LED device. This removes the requirement for buffer amplifiers to maintain signal integrity over long distances while preserving series control compatibility.
Solution Approach 2:
Each LED device generates its own latch signal automatically based on detecting the absence of clock signals, making the system self-sufficient and eliminating the need for external buffer amplifiers to maintain signal quality across the series-connected network.
Data Source
AI summary
A control circuit for controlling an LED device according to an input data signal and a clock signal is disclosed. The control circuit includes at least one first control module. The first control module includes a shift register unit, a latch register unit, an LED driving circuit, and a latch signal generator. The shift register unit includes at least one shift register and is triggered by the clock signal for buffering data transmitted in the input data signal. The latch register unit includes at least one latch register and is triggered by a latch signal for latching data buffered by the shift register. The LED driving circuit is utilized for driving the LED device according to data latched by the latch register. The latch signal generator is used to generate the latch signal according to the input data signal and the clock signal.