Abstract: A mobile phone 10 comprises a display 14 provided with an LED (46) that functions as a backlight, a display driver (42), etc. The display driver has a CABC (Content Adaptive Brightness Control) function to adjust illuminance of the backlight, an image quality of an image to be displayed, etc. based on the image that is displayed on the display 14. If a residual battery quantity of a secondary battery (58) becomes equal to or less that a first threshold value, for example, the CABC function is rendered in an enabled state. Furthermore, if the residual battery quantity becomes equal to or less that a second threshold value, an image parameter such as brightness, contrast, a gamma value, chroma saturation, etc. is changed such that the image that is output to the display driver becomes darker.

Abstract: A mobile phone 10 comprises a display 14 provided with an LED (46) that functions as a backlight, a display driver (42), etc. The display driver has a CABC (Content Adaptive Brightness Control) function to adjust illuminance of the backlight, an image quality of an image to be displayed, etc. based on the image that is displayed on the display 14. If a residual battery quantity of a secondary battery (58) becomes equal to or less that a first threshold value, for example, the CABC function is rendered in an enabled state. Furthermore, if the residual battery quantity becomes equal to or less that a second threshold value, an image parameter such as brightness, contrast, a gamma value, chroma saturation, etc. is changed such that the image that is output to the display driver becomes darker.

Abstract: A mobile communication terminal stores a plurality of response messages generated according to respectively different audio compression methods. If the mobile communication terminal is not answered when an incoming call is received, the mobile communication terminal transmits the one of the response messages that has been generated according to the audio compression method designated by a base station.

Abstract: A mobile communication terminal stores a plurality of response messages generated according to respectively different audio compression methods. If the mobile communication terminal is not answered when an incoming call is received, the mobile communication terminal transmits the one of the response messages that has been generated according to the audio compression method designated by a base station.

Abstract: A cordless telephone includes a handset cordlessly linked to a base unit. The base unit includes a storage device for storing a security ID. A detection device detects a start of a charge. A first transmission device transmits the security ID to the handset. A generating device generates a new security ID which is different from the security ID. A second transmission device transmits the new security ID to the handset. A judging device judges whether a response corresponds to either the security ID transmitted by the first transmission device or the new security ID transmitted by the second transmission device has been received from the handset. A link device establishes a cordless link with the handset. An update device updates the security ID stored in the storage device. The new security ID is generated when response from the handset is not received within a predetermined time.