Accumulating Outside Light Detection in Electrooptical Displays

The patent applies preliminary action by accumulating outside light intensity values over multiple vertical blanking intervals before performing detection. The light sensor accumulates outside light values in a memory unit during predetermined periods when backlight emission is stopped, and only after sufficient accumulation does the control unit calculate the final outside light intensity. This allows the system to achieve accurate detection without requiring a single long backlight stop period, thus avoiding flicker while maintaining detection accuracy.

The patent implements continuity of useful action by continuously accumulating outside light intensity values over multiple vertical blanking intervals rather than attempting to complete detection within a single interval. The light sensor continuously accumulates values during each predetermined period when backlight is stopped, and the control unit processes these accumulated values to calculate the final outside light intensity. This continuous accumulation approach allows the system to achieve accurate detection despite the short duration of individual vertical blanking intervals.

The patent applies periodic action by having the light sensor operate intermittently during predetermined periods when backlight emission is stopped, such as during vertical blanking intervals. Instead of continuous operation, the sensor accumulates outside light values only during these periodic windows when interference from backlight is minimal. The control unit then processes these periodically accumulated values to calculate the final outside light intensity, achieving both detection continuity over time and accuracy during each detection window.