Scanning Display Pulse Control for Low-Brightness Color Depth

The patent applies periodic action by using pulse width modulation instead of continuous amplitude scaling. The light source is driven with periodic pulses of fixed amplitude, where the duty cycle (pulse width ratio) controls the perceived brightness. This allows the full current amplitude range to be maintained for color precision while achieving brightness control through temporal averaging.

The patent implements dynamics by making the pulse frequency adaptive based on ambient light conditions. The system dynamically adjusts the pulse repetition frequency - using higher frequencies in bright environments and lower frequencies in dark environments - while maintaining the full amplitude range for color accuracy. This dynamic adaptation resolves the contradiction between brightness control and color depth preservation.

The patent uses periodic pulsed operation where the light source receives full-amplitude current pulses rather than continuous reduced current. The pulse frequency is adjusted to match the display refresh requirements, allowing the laser to operate above its lasing threshold during each pulse while achieving reduced average power consumption through duty cycle control.

The system dynamically adapts the pulse frequency based on ambient light conditions. In bright environments, higher pulse frequencies are used, while in dark environments, lower frequencies reduce power consumption. Crucially, the pulse amplitude remains above the lasing threshold throughout, maintaining lasing efficiency while controlling overall power consumption through frequency and duty cycle adjustment.

The patent employs periodic pulse trains with fixed amplitude that maintain the full dynamic range required for representing all color values. By using pulse width modulation where the duration of pulses varies while amplitude remains constant, the system preserves color precision (256 levels) while controlling brightness through the duty cycle of the periodic pulses.

The system dynamically adjusts the pulse frequency and duty cycle based on ambient light conditions and desired brightness level, while maintaining the full amplitude range. This dynamic approach ensures that the electric current resolution is always sufficient to represent all color values, regardless of the target brightness level, because the full amplitude range is always available during each pulse.