For the first time, we have fabricated a novel Switchable Transmissive and Reflective (STR) LCD based on dual gap TN (Twisted-Nematic) mode using a general a-Si TFT process. This new technology creates ultra low power LCD using reflective mode. This new device has no power consumption of backlight in ordinary room light environment. Moreover our new LCD offers superior outdoor visibility and enhanced portability to user. We will show vision as a future LCD mode for portable electronic devices.