Display Apparatus Control for Smooth PWM-to-Analog Dimming Transitions

Before switching between PWM and analog dimming modes, the control circuit pre-adjusts the current amplitude to a target value using a predetermined step size. This preliminary action ensures that the current transition is gradual and controlled, preventing sudden current changes that could damage the switch transistor or light emitting element during mode switching.

The control circuit dynamically adjusts the current amplitude by modifying both the current amplitude and duty ratio parameters during mode transitions. This dynamic adjustment approach allows the system to adaptively manage the transition process, ensuring smooth switching between dimming modes while maintaining component reliability.

The control circuit changes multiple parameters (current amplitude and duty ratio) simultaneously during mode transitions. By coordinating the adjustment of these parameters with predetermined step sizes, the system achieves a balance between ensuring reliable component operation and managing the transition time efficiently.

The control circuit implements a cushioning mechanism by pre-adjusting current parameters before the actual mode switch occurs. This beforehand cushioning prevents sudden current spikes that would cause excessive loss and temperature rise, while the predetermined step size manages the transition duration to minimize time loss.