Flexible Backlight Control Circuit for LCD Power Management

The patent divides the LED array into multiple independent strings or groups that can be selectively activated. Instead of connecting all LEDs in parallel requiring high voltage, the circuit segments them into smaller subsets that can operate at lower voltages, reducing the need for expensive high-voltage components while maintaining adequate overall brightness through selective illumination of multiple segments.

The patent implements dynamic control of LED string activation based on actual backlighting requirements. The system can dynamically select which LED strings to activate and how many, adjusting the output configuration in real-time. This dynamic adaptation allows the system to use fewer LEDs at lower voltages when full brightness is not needed, reducing component requirements and power consumption.

The patent segments the LED array into multiple independent strings with individual control capability. This segmentation enables the circuit to activate only the necessary number of LED strings based on actual lighting requirements, significantly reducing power consumption compared to having all LEDs permanently connected in parallel and continuously active. The segmented structure maintains relatively simple circuit configuration while enabling selective activation.

The patent implements periodic or selective activation of different LED strings rather than continuous operation of all LEDs. By controlling which strings are active at any given time and potentially cycling through different configurations, the system reduces average power consumption and heat generation while maintaining the ability to provide full brightness when needed.

The patent extracts or removes the problematic excess pins from the active voltage selection process. By providing a dedicated connection path that excludes excess pins from the lowest voltage selection circuit's consideration, the system prevents these pins from being selected and causing uncontrolled voltage increases. This extraction approach maintains pin configuration simplicity while ensuring voltage control stability.

The patent introduces an intermediary mechanism or circuit element that mediates between the excess pins and the lowest voltage selection circuit. This intermediary prevents the excess pins from directly influencing the voltage selection process, blocking their potential to cause uncontrolled voltage increases while allowing the pins to maintain their simple configuration without complex control circuitry.