LCD Backlight PWM Control for Smooth Temperature Compensation

The patent implements dynamic adjustment of the duty ratio based on temperature changes. Instead of a fixed threshold-based reduction, the system continuously monitors temperature and dynamically adjusts the PWM duty ratio to maintain liquid crystal stability while minimizing brightness fluctuations. This is achieved by updating the duty ratio in a stepwise manner rather than making abrupt changes.

The patent employs periodic temperature monitoring and stepwise duty ratio updates. The control circuit periodically checks the temperature sensor readings and adjusts the PWM signal duty ratio in incremental steps rather than single abrupt changes. This periodic adjustment mechanism allows the system to maintain liquid crystal stability while reducing sudden brightness drops that cause user discomfort.

The patent segments the duty ratio adjustment process into multiple smaller steps rather than a single abrupt change. When temperature control is needed, the control circuit reduces the duty ratio in incremental steps over multiple update cycles. This segmentation of the adjustment process protects liquid crystal properties while ensuring smooth brightness transitions that maintain ease of operation and user comfort.

The patent implements a cushioning mechanism by preparing intermediate duty ratio values before making the final adjustment. When temperature control is required, the system calculates intermediate duty ratio steps and transitions through them sequentially, cushioning the impact of the full adjustment. This beforehand cushioning prevents sudden brightness changes while still achieving the necessary temperature control for liquid crystal stability.