Display Apparatus Signal Generation for Power Reduction

The patent applies periodic action by using pulse width modulation (PWM) to drive pixels with periodic enable signals. The enable signal is activated only during specific time slots when data needs to be updated, rather than continuously. This periodic activation reduces the frequency of column signal line changes, thereby lowering power consumption while maintaining the ability to sequentially drive pixels row by row through scanning line selection.

The patent implements preliminary action by pre-defining time slots for each row before the actual pixel driving begins. The controller pre-calculates and prepares the enable signal timing based on the scanning line sequence, so that column signals are only changed when necessary (i.e., when the enable signal is active). This preliminary planning of signal timing prevents unnecessary frequent changes in column signal line values, reducing power consumption while maintaining efficient pixel driving.

The enable signal operates periodically within defined time slots, allowing column signal changes only during these active periods. This periodic gating ensures that signal changes occur only when necessary for image updates, maintaining image quality while reducing the total number of signal transitions and associated energy loss.

The patent applies local quality by making the enable signal row-specific and time-slot-specific. Each row has its own enabled time period during which column signals can change. This localized control ensures that signal changes occur only in the specific row and time slot where they are needed, rather than globally across all pixels, thereby maintaining image quality where required while minimizing unnecessary signal changes and energy consumption elsewhere.