CCFL Light Effect Control via PWM Frequency Modulation
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Solution Overview
Problem
Conventional cold cathode fluorescent lamps (CCFL) lack the ability to produce diverse light effects, limiting their application in various electronic devices such as navigational systems, digital cameras, and LCD TVs, which require adjustable light sources.
Innovation Solution
An electronic device comprising a PWM controller, driver, and transformer is connected to the CCFL, enabling the generation of different light effects by modulating the oscillation frequency of the voltage signal, allowing for flashing, non-flashing, and static light patterns through pulse width modulation and amplification of voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CCFL is used without additional control circuitry, then the device structure remains simple, but the light effect diversity is limited
Solution Approach 1:
The patent makes the CCFL serve multiple functions by enabling it to produce diverse light effects (flashing, static, dimming, etc.) through frequency modulation, allowing a single component to replace what would traditionally require multiple different light sources or complex optical systems
Solution Approach 2:
The patent introduces dynamic control of the CCFL by modulating the oscillation frequency of the driving voltage signal, transforming the static light output into a dynamically adjustable system that can switch between different light effects in real-time
2Adaptability or versatility
If CCFL is used for backlight modules, then stable light source is achieved, but the ability to produce diverse light effects is lost
Solution Approach 1:
The patent changes the operating parameters of the CCFL by modulating the frequency of the driving voltage signal, enabling the lamp to transition between different operational states (flashing, static, dimming) while maintaining reliable operation within each state
3Adaptability or versatility
If PWM controller and driver circuitry are added to CCFL, then light effect diversity is improved, but device complexity increases
Solution Approach 1:
The patent introduces a PWM controller and driver circuit as intermediary components that translate control signals into appropriate voltage signals for the CCFL, acting as a bridge between the control system and the light source to enable sophisticated light effects without directly modifying the CCFL itself
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 electronic device expands the application of CCFLs by generating a range of light effects, including flashing and static patterns, enhancing their utility in diverse electronic devices by adjusting the light output based on oscillation frequency.
Implementation Method 1
the transformer amplifies the first voltage signal to generate a second voltage signal
Implementation Method 2
a light effect is generated by the CCFL according to the second voltage signal
Data Source
AI summary
An electronic device adapted for adjusting a light effect of a CCFL is provided. The electronic device is electronically connected to the CCFL. The electronic device comprises a PWM controller configured to receive at least a digital signal and to output a specific-frequency reference signal according to the digital signal, a driver electronically connected to the PWM controller and configured to output a first voltage signal according to the specific-frequency reference signal, and a transformer electronically connected to the driver and the CCFL. The transformer amplifies the first voltage signal to generate a second voltage signal and sends the second voltage signal to the CCFL. A light effect is generated by the CCFL according to the second voltage signal.