LED Driving Circuit Uniform Illumination Feedback Control

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Solution Overview

Problem

Conventional LED display devices face challenges in uniform brightness control due to the differences in electrical characteristics between light-emitting diodes and liquid crystal molecules, leading to inconsistent illumination.

Innovation Solution

A driving circuit comprising a control module, a driving module, and a detecting module that adjusts the waveform of driving signals based on detected voltage or current to ensure uniform illumination of the light emitting diode module, enhancing control precision and performance across various brightness levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional driving circuits are used for LED display devices, then the device structure is simple, but the illumination uniformity across different control signals deteriorates due to differences in electrical characteristics between light-emitting diodes and liquid crystal molecules

Engineering Contradiction:

Improveillumination uniformityVSAvoiddriving circuit structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the control module receives feedback signals from the LED module and adjusts the driving waveforms accordingly. The control module stores multiple sets of driving waveforms with different duty cycles and selectively applies them based on the detected control signal characteristics, creating a closed-loop control system that compensates for electrical characteristic differences and achieves uniform illumination.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent dynamically adjusts the driving waveform parameters (duty cycle) based on the detected control signal characteristics. Instead of using a fixed driving waveform, the system selectively applies different waveforms from stored sets, making the driving circuit adaptive to varying electrical characteristics and ensuring consistent illumination uniformity across different operating conditions.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If the driving signal waveform is adjusted to compensate for electrical characteristic differences, then the illumination uniformity is improved, but the control precision requirement increases

Engineering Contradiction:

Improveillumination uniformityVSAvoidcontrol precision

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The control module pre-stores multiple sets of driving waveforms with different duty cycles before operation. By having the appropriate waveforms ready in advance, the system can quickly switch to the correct waveform without requiring complex real-time calculations, thereby maintaining control precision while achieving illumination uniformity through selective waveform application.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the duty cycle parameter of the driving signal to compensate for electrical characteristic differences. By adjusting this key parameter and storing multiple waveform variants, the system achieves illumination uniformity without requiring excessive control precision, as the pre-prepared waveforms are designed to account for expected variations.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple sets of driving waveforms with different duty cycles are stored and selectively applied, then the adaptability to different control signals is improved, but the control module complexity increases

Engineering Contradiction:

Improveadaptability to control signalsVSAvoidcontrol module structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The control module pre-stores multiple sets of driving waveforms with different duty cycles in memory before operation. This preliminary preparation allows the system to adapt to different control signal characteristics by simply selecting from the pre-computed waveforms, rather than calculating optimal waveforms in real-time, thereby reducing the computational complexity of the control module while maintaining high adaptability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent achieves adaptability by changing the duty cycle parameter of driving waveforms. By storing multiple waveform sets with varying duty cycles and selecting the appropriate one based on detected control signal characteristics, the system provides versatility without requiring complex real-time parameter adjustment mechanisms, thus limiting control module complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10448475B2Driving circuit and illumination device

Publication Date: 2019.10.15 SILICON TOUCH TECH INC

AI summary

A driving circuit for driving a light emitting diode module includes: a control module; a driving module electrically connected to the control module and the light emitting diode module for providing a plurality of driving signals to drive the light emitting diode module; and a detecting module electrically connected to the light emitting diode and the control module, the detecting module detecting a voltage or a current of the light emitting diode module and transmitting a detecting signal corresponding to the voltage or the current of the light emitting diode module to the control module. The control module adjusts a waveform of at least one driving signal of the driving signals for driving the light emitting diode module to illuminate uniformly at a driving time interval of the at least one driving signal of the driving signals.