An optical unit, a method of manufacturing the same, a backlight assembly having the same and a display device have the same are provided. In one embodiment, contexts associated with a process are identified. For example, when a call involving the multi-mode mobile is established via the WLAN, the call includes a WLAN call leg that extends from the conference bridge to the multi-mode mobile station via the WLAN. The master cylinder pressure is estimated during brake apply to be equal to the first master cylinder pressure when the vehicle deceleration is below a predetermined deceleration value.